Fix bug: cannot validate with 0 amount
Fix bug: cannot validate with 0 amount

bank-netforce/netforce,anastue/netforce,anastue/netforce,bank-netforce/netforce,bank-netforce/netforce,bank-netforce/netforce,bank-netforce/netforce,anastue/netforce,anastue/netforce,anastue/netforce,bank-netforce/netforce,anastue/netforce